Process and apparatus for splicing web

Abstract

A process and an apparatus for splicing a web of paper being continuously supplied without decelerating the machine speed and with a minimum of material loss. A new paper web is spliced to the old paper web with adhesive tape and the old paper is cut off just behind the spliced point by means of a plate member which cooperates with a fixed blade provided along the run of the spliced paper.

What is claimed is: 
     
       1. A process for splicing paper from a first roll of paper in a standby position to paper already being supplied from another roll of paper by an overlapping joint, said process comprising the steps of: placing a plate member against the side of the paper from the first roll which is to be overlapped onto the opposing surfaces of the paper from the other roll and slightly spaced from and substantially parallel to the leading edge of the paper from the first roll;   applying adhesive means to said side of the paper from the first roll along the leading edge thereof with a portion thereof applied to said plate member for holding the plate member to the paper from the first roll;   holding the leading end of the paper from the first roll in position for splicing;   pressing the leading end of the paper from the first roll of paper against the opposed side of the paper from the other roll to splice the two papers in an overlapping joint by the adhesive means with said plate member held therebetween at a point just following the joint in the direction of travel of the papers; and   passing the thus spliced papers over a blade having a cutting edge directed in a direction opposite to the direction of travel of the papers with the side of the paper from the other roll which is opposite from the side to which the paper from the first roll has been adhered being against one side surface of said blade, thereby cutting said paper from said other roll immediately behind the portion adhered to the paper of said first roll by means of said blade cooperating with said plate member when the plate member passes said blade along the other side thereof.   
     
     
       2. A process as claimed in claim 1 wherein said adhesive means is a single strip of double face adhesive material having one face adhered to the paper from said first roll and overlapping the surface of the plate member facing the paper from the other roll, whereby the single strip of adhesive material adheres the paper from the first roll to the paper from the other roll, adheres the plate member to the paper from the first roll prior to splicing, and adheres the plate member to the paper from the other roll immediately after the splicing. 
     
     
       3. A process as claimed in claim 1 wherein said adhesive means is a single strip of double face adhesive material having one face adhered to the paper from said first roll and to which the plate member is adhered on the face of the strip of adhesive material facing the paper from the other roll and a further strip of double face adhesive material on the face of said plate member facing the paper from the other roll. 
     
     
       4. A process as claimed in claim 1 wherein said plate member is positioned on said paper from said first roll in a direction substantially perpendicular to the direction of travel of the papers, and the cutting edge of said blade is at an angle to the direction of travel of the papers. 
     
     
       5. An apparatus for splicing a paper from a first roll of paper in a standby position to paper already being supplied from another roll of paper by an overlapping joint, said apparatus comprising: paper guide means for guiding the paper from said other roll of paper in a path through said splicing apparatus;   support means adjacent and spaced from the path of the paper from the other roll for supporting the leading edge of paper from the first roll in the standby position and movable toward said path for moving the leading edge of the paper from the first roll to a position where it is pressed against the paper from the other roll;   a plate member for placing against the side of the paper from the first roll where it is supported on said support means and slightly spaced from and substantially parallel to the leading edge of the paper from the first roll;   means in said support means for holding said plate member in position against the paper supported by the support means;   adhesive means for application to the side of the paper from the first roll along the leading edge thereof with a portion thereof applied to said plate member for holding the plate member to the paper from the first roll; and   a blade positioned along the path of the papers through the splicing apparatus and on the opposite side of the path from the side on which said support means is positioned and sufficiently close to the path for the paper from the other roll to contact the side surface of the blade, said blade having a cutting edge facing in a direction opposite to the direction of travel of the papers for cooperating with said plate member as said plate member moves past said blade for cutting the paper from said other roll immediately behind the portion adhered to the paper of said first roll.   
     
     
       6. An apparatus as claimed in claim 5 in which said adhesive means is a single strip of double face adhesive material, one face being for adherence to the paper from said first roll and overlapping and adhering to the surface of said plate member facing the paper from the other roll, whereby the single strip of adhesive material adheres the paper from the first roll to the paper from the other roll, adheres the plate member to the paper from the first roll prior to splicing, and adheres the plate member to the paper from the other roll immediately after the splicing. 
     
     
       7. An apparatus as claimed in claim 5 wherein said adhesive means is a single strip of double face adhesive material having one face for adherance to the paper from said first roll and to which the plate member is adhered on the face of the strip of adhesive material facing the paper from the other roll, and a further strip of double face adhesive material on the face of said plate member facing the paper from the other roll. 
     
     
       8. An apparatus as claimed in claim 5 further comprising a plate guide means along the path of the papers between said support means and said blade for guiding the plate member for causing it to pass on the side of the blade facing away from the path of the papers.